Maintain minimal error response.

content/browser/renderer_host/render_widget_host_view_base.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 
 #include "base/logging.h"
 #include "base/profiler/scoped_tracker.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/gpu/gpu_data_manager_impl.h"
@@ skipping 592 matching lines @@
 
 void RenderWidgetHostViewBase::FlushInput() {
   RenderWidgetHostImpl* impl = NULL;
   if (GetRenderWidgetHost())
     impl = RenderWidgetHostImpl::From(GetRenderWidgetHost());
   if (!impl)
     return;
   impl->FlushInput();
 }
 
-SkColorType RenderWidgetHostViewBase::PreferredReadbackFormat() {
-  return kN32_SkColorType;
-}
-
 void RenderWidgetHostViewBase::OnTextSurroundingSelectionResponse(
     const base::string16& content,
     size_t start_offset,
     size_t end_offset) {
   NOTIMPLEMENTED();
 }
 
 void RenderWidgetHostViewBase::ShowDisambiguationPopup(
     const gfx::Rect& rect_pixels,
     const SkBitmap& zoomed_bitmap) {
@@ skipping 66 matching lines @@
 
   return primary_landscape_angle == angle
       ? blink::WebScreenOrientationLandscapePrimary
       : blink::WebScreenOrientationLandscapeSecondary;
 }
 
 void RenderWidgetHostViewBase::OnDidNavigateMainFrameToNewPage() {
 }
 
 }  // namespace content